Heating, ventilating and air- conditioning systems are often invisible to the occupant. Hidden behind walls and snaking through ceilings, HVAC is noticed only when it breaks down. Photo: Jeffrey Rubenstone / ENR A live feed of McQuay’s testing facility in Staunton, Va., is the centerpiece of the Solution Plaza’s conference room, which also sports its own variable-refrigerant-volume system. Photo: Jeffrey Rubenstone / ENR At the Daikin-McQuay Solutions Plaza in Jersey City, N.J., mechanical systems—which normally are relegated to closets, rooftops and wall spaces—are the main attraction, highlighting the latest offerings in energy-efficient building design. (above/below) Photo: McQuay McQuay International, a
Arch dams, classically curved monoliths situated in narrow valleys, are not as common as other types of dams, such as embankment dams and gravity dams. ENR takes a look at some of the biggest arch dams in the world, both completed and under construction.